Injury in PE class

I got injured in my PE class like three weeks ago and I thought it would have gotten better by now (I've been following the RICE method and was absent from class this week), but it's gotten to the point where the pain is moving to other parts of my body. I unfortunately don't have insurance right now so I can't get medical advice but I am lost on whether I should withdraw from the class. Does anyone have experience with getting an injury in a PE class? Thanks in advance for any insight!